| Year | Rank | Number |
| 2011 | 2715 | 44 |
| 2010 | 2774 | 44 |
| 2009 | 2864 | 42 |
| 2008 | 2992 | 40 |
| 2007 | 2853 | 42 |
| 2006 | 2973 | 38 |
| 2005 | 2650 | 42 |
| 2004 | 2838 | 37 |
| 2003 | 3114 | 31 |
| 2002 | 2552 | 39 |
| 2001 | 2673 | 36 |
| 2000 | 2295 | 43 |
| 1999 | 1901 | 52 |
| 1998 | 2918 | 28 |
| 1997 | 2973 | 26 |
| 1996 | 4391 | 15 |
| 1995 | 3685 | 18 |
| 1994 | 3902 | 17 |
| 1993 | 4687 | 13 |
| 1992 | 5648 | 10 |
| 1991 | 9632 | 5 |
| 1989 | 6210 | 8 |